<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="root"></div>


  <script crossorigin src="https://unpkg.com/react@18.3.1/umd/react.development.js"></script>
  <script crossorigin src="https://unpkg.com/react-dom@18.3.1/umd/react-dom.development.js"></script>
  <script crossorigin src="https://unpkg.com/babel-standalone@6.26.0/babel.min.js"></script>

  <script type="text/babel">

    class App extends React.Component {
      constructor() {
        super()
      }
      render() {
        return (
          <div>
            <div className="header">header</div>
            <div className="main">
              <div className="banner">banner</div>  
              <div>数据列表</div>
            </div>
            <div className="footer">footer</div>
          </div>
        )
      }
    }
    
    const root = ReactDOM.createRoot(document.querySelector('#root'))
    root.render(<App/>)
  </script>
</body>
</html>